Onebox redirects prevent linking to login-only content

Onebox follows redirects, which is usually a good thing, I guess.

This becomes a problem, however, when you share a link to a page requiring sign-in that simply redirects to a sign-in page when an anonymous user visits it.

For example, if I want to share my top secret project hosted at https://dgit.cs.uni-saarland.de/fefrei/my-top-secret-project/ in the internal category of our Discourse instance, this is what I get by default:

Note that all links in the Onebox go to https://dgit.cs.uni-saarland.de/users/sign_in, which is not helpful.

Of course, as a post author, I can prevent that by using any alternative markup that prevents the Onebox (which can’t show relevant content anyways); but if some other user does this and doesn’t notice, it’s pretty hard to retrieve the actual link.
As staff, I can edit the post to get the raw markup, but as a non-staff user, I think the only feasible workaround is to remember the magic /raw/ URL scheme.

Why does the Onebox link to the final location, not the original URL? Can we do something to improve this?

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Why wouldn’t it link to the final location?

I typed https://dgit.cs.uni-saarland.de/fefrei/my-top-secret-project/, why should it link somewhere else?

When I’m redirected to the sign in page, this is fine, because I’m in a session – I can actually log in, and will be redirected back to the target URL.
When Discourse follows the redirect, forgets the original URL and just outputs the sign in URL, the reader has no (easy) way to get to the URL the author linked to.

Well, the workaround is to enter the link with angle brackets. It’s normal and expected to follow link redirects to the final destination.

I know that’s the current behavior, and already mentioned the workaround above:

I stumbled about this because another user fell for this trap, and I had to fish the actual link out of the raw view.

I’m not saying that this is terribad and needs to be fixed now or else; I’m just reporting that I find it sad that a user who simply pasted a link into his post got a Onebox that obfuscates the link in a way that makes it impossible for the average user to understand where to go. (There’s a reason I posted this in #feature.)

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